What is the formula of first Fresnel zone calculation? 
Answer: The general equation for calculating the Fresnel zone radius at any point P in between the endpoints of the link is the following:Fn ,Fn F_n = sqrt{frac{n lambda d_1 d_2}{d_1 + d_2}} where, Fn = The nth Fresnel Zone radius in metres d1 = The distance of P from one end in metres d2 = The distance of P from the other end in metres lambda = The wavelength of the transmitted signal in metres The cross sectional radius of each Fresnel zone is the longest at the midpoint of the RF LoS, shrinking to a point at the antenna on each end. For practical applications, it is often useful to know the maximum radius of the first Fresnel zone. From the above formula, the following formulas can be derived, using d_1 = d_2, D = d_1 + d_2, and lambda = frac{c}{f}. Now we have an easy way to calculate the radius of the first Fresnel zone (F1 in the above equation), knowing the distance between the two antennas and the frequency of the transmitted signal. 
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